<template>
  <div class="login-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="登录" >
    <van-icon
    slot="left"
    name="cross"
    @click="$router.back()"
    />
    </van-nav-bar>
    <!-- /导航栏 -->
    <!-- 登陆表单 -->
    <!--
          表单验证
          1.给 van-field 组件配置 rules 验证规则
          参考文档：https://vant-contrib.gitee.io/vant/#/zh-CN/form#rule-shu-ju-jie-gou
          2.当表单提交的时候会自动触发表单验证
          如果验证失败，会触发submit事件
          如果验证成功，不会触发submit
          -->
    <van-form ref="loginForm" @submit="onSubmit">
      <van-field v-model="user.telephone" required clearable name="telephone"
        placeholder="请输入手机号" :rules="userFormRules.telephone" type="number"
        maxlength="11">
        <i slot="left-icon" class="toutiao toutiao-shouji"></i>
        <!-- 通过插槽处理自定义图标 -->
      </van-field>
      <van-field v-model="user.code" name="code" placeholder="请输入验证码"
        :rules="userFormRules.code" type="number" maxlength="6">
        <i slot="left-icon" class="toutiao toutiao-yanzhengma"></i>
        <!-- 通过插槽处理自定义图标 -->
        <template #button>
          <!--
            time：倒计时时间
            -->
          <van-count-down v-if="isCountDownShow" :time="1000 * 60" format="ss s"
            @finish="isCountDownShow = false" />
          <van-button v-else class="send-sms-btn" native-type="button" round
            size="small" type="default" @click="onSendSms">发送验证码</van-button>
        </template>
      </van-field>
      <div class="login-btn-wrap">
        <van-button class="login-btn" block type="info" native-type="submit">
          登录
        </van-button>
      </div>
    </van-form>

    <!-- /登陆表单 -->

  </div>
</template>

<script>
import { login, sendSms } from '@/api/user'

export default {
  name: 'LoginIndex',
  components: {},
  props: {},
  data () {
    return {
      user: {
        telephone: '',
        code: ''
      },
      userFormRules: {
        telephone: [{
          required: true,
          message: '手机号不能为空'
        }, {
          pattern: /1[3|5|7|8]\d{9}$/,
          message: '手机号格式错误'
        }],
        code: [{
          required: true,
          message: '验证码不能为空'
        }, {
          pattern: /\d{6}$/,
          message: '验证码格式错误'
        }]
      },
      isCountDownShow: false // 是否展示倒计时
    }
  },
  computed: {},
  watch: {},
  created () { },
  mounted () { },
  methods: {
    async onSubmit () {
      // 1.获取表单数据
      // const user = this.user
      // 2.表单验证
      // 在组件中必须通过this.$toast 来调用Toast组件
      this.$toast.loading({
        message: '登录中...',
        forbidClick: true, // 禁用背景点击
        duration: 0 // 持续时间,默认是2000 .如果为0则持续到成功
      })
      // 2. 请求登录
      try {
        const { data } = await login(this.user)
        this.$store.commit('setUser', data.data)
        localStorage.setItem("userId", data.data.id)
        this.$toast.success('登录成功')
        // 登录成功，跳转回原来页面
        // back 的方式不严谨，后面讲功能优化的时候再说
        this.$router.back()
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.fail('手机号或者验证码错误')
        } else {
          this.$toast.fail('登录失败，请稍候重试')
        }
      }
    },
    async onSendSms () {
      console.log('onSendSms')
      // 1.校验手机号
      try {
        await this.$refs.loginForm.validate('telephone')
        console.log('验证通过')
      } catch (err) {
        return console.log('验证失败', err)
      }

      // 2.验证通过：显示倒计时
      this.isCountDownShow = true
      // 3.请求发送验证码
      try {
        await sendSms(this.user.telephone)
        this.$toast('发送成功')
      } catch (err) {
        this.isCountDownShow = false
        if (err.response.status === 429) {
          this.$toast('发送太频繁，你不能等会？？？？？？')
        } else {
          this.$toast('发送失败，等会再试')
        }
      }
    }
  }
}
</script>

<style scoped lang="less">
.login-container {
  .toutiao {
    font-size: 37px;
  }
  .send-sms-btn {
    width: 152px;
    height: 46px;
    line-height: 46px;
    background-color: #ededed;
    font-size: 22px;
    color: #666;
    padding: 0;
  }
  .login-btn-wrap {
    padding: 53px 33px;
    .login-btn {
      background-color: #6db4fb;
      border: none;
    }
  }
}
</style>
